So, first find where Store c9edaf86-4286-4fda-b357-e642fc8d3abb is on disk
Look in mailbox folder e41073d1-5aed-4a43-81fd-87c494a2e065
Then see if file 213d8b47-a111-4e09-8f67-406c4f59e02f.esa (or .esa2) exists.

If it does then the meta DB has been corrupt, so you’ll probably need to upgrade to V3 and repair the store. If that file or mailbox isn’t there then we need to find out what else has gone wrong. Have you moved any mailboxes recently? Have you changed the UAA Service URL? Any other changes to the ESA environment?